Recommended length of the bolt for U-21 channels is 20mm when mounting parts with material thickness 5mm. Recommended length of the bolt for U-41 channels is 30mm when mounting parts with material thickness of 5mm. Increase the length of the bolt accordingly when mounting parts with more than 5mm material thickness. Longer lengths in DIN 931 partly threaded. STD: 200.
|K Bolt Head Height (mm)||6.4|